With a HINT of ammonia.
The Big Bang Theory Season 5, Episode 7
I'll give you a HINT.
The Big Bang Theory Season 1, Episode 6
Hint: it's based
on Sanskrit,
The Big Bang Theory Season 12, Episode 2
All right, give me a HINT.
The Big Bang Theory Season 7, Episode 7
Is "back on track" a HINT
that it has something to do with trains?
The Big Bang Theory Season 10, Episode 11